Which of the following methods is used to control temperature in resistance furnaces ?
Correct answer: D. All of the above methods
- A. Variation of resistance
- B. Variation of voltage
- C. Periodical switching on and off of the supply
- D. All of the above methods
Explanation
Furnace temperature can be regulated by changing resistance, varying the applied voltage, or switching the supply periodically. Therefore, all the listed methods are used.
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